320bhp N/A 5 cylinder engine

[austenw]

Hi everyone

I would be gratefull if you could steer me in the right direction.

I am currently building a 5 cylinder 20v N/A Volvo engine for a caterham hill climb car here in the UK, this is my hobby.


Details of the engine spec are:
S60 base engine

35mm inlet valve 6mm stem
31mm exhaust valve 6mm stem
double valve springs
titanium retainers
32mm solid buckets
Cat cams 305 deg inlet 13.5mm lift
Cat Cams 290 deg exh 12.5 mm lift
Larger seats
Extensive head porting to suit

13:1 high compression pistons made to my spec from CP 83mm bore

2.0l 77mm steel crank

152mm h section rods,, give rod ratio of almost 2:1

3 stage Dry Sump system

Useing Jenvey inlet system, inc Individual throttle bodies

Motec Management system

The engine will be a 2.1L screamer

The questions I have are:

What cams have you found to work the best? duration / lift
What diameter exhaust before and after the collector? and exhaust length?
What size diameter inlet throttle bodies? What length?


I am looking to achieve 320bhp and rev it to 9500rpm which should be achievable

I would be gratefull for any help you could give me to achieve my goal

Regards

Austen